package encaps.utils;

import encaps.resources.Config;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ImageServlet extends HttpServlet {

    public static final String PATH = "path";
    public static final String IMAGE_SERVLET_NAME = "getImage";
    public static final String IMAGE_CONTENT_TYPE = "image/";
    public static final String SERVLET_DESCRIPTION = "Image servlet";

    /**
     * Processes requests for both HTTP
     * <code>GET</code> and
     * <code>POST</code> methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String path = request.getParameter(PATH);
        /*
         * if(StringUtil.isEmpty(path) || "null".equals(path)) { path =
         * Config.getDefaultImage(); } File imageFile = new File(path);
         */
        File imageFile = new File(path);
        if (!imageFile.exists() || !imageFile.isFile()) {
            path = Config.getDefaultImage();
            imageFile = new File(path);
        }
        String imageType = StringUtil.getFileExtension(path);
        response.setContentType(IMAGE_CONTENT_TYPE + imageType);
        OutputStream out = response.getOutputStream();
        try {
            BufferedImage image = ImageIO.read(imageFile);
            ImageIO.write(image, imageType, out);
        } finally {
            out.close();
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP
     * <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP
     * <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return SERVLET_DESCRIPTION;
    }// </editor-fold>
}
